That's not me!

These stars stripped for the cameras. Or did they? Instead of baring it all on film, Mila Kunis (L) and Jessica Alba (R) opted for body doubles. See who else refused to show off their goods.

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Kit Harrington

"Pompeii" star Harrington told GQ that if "it's only right, if you’re going to make a show where nudity and sex is a large part of it that you be a part of that." So why did the 27-year-old actor opt for a butt double in "Pompeii?" "When it came down to it I had a broken ankle," he says, "so the only time you saw my ass, it wasn't my ass."

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Brooke Shields

Brooke showed off quite the curvy backside for a 14-year-old while skinny dipping in 1980's "Blue Lagoon," but the young actress actually had a body double do the deed.

(Reuters)

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Penelope Cruz

The Spanish beauty was pregnant while filming "Pirates of the Caribbean 4," but luckily she had just as stunning little sis Monica to fill in. Pays to have good genes!

(Reuters)

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Catherine Zeta-Jones

Fans may think they got a rare glimpse of Catherine Zeta-Jones in the buff in "Traffic" (2000), but it was actually a body double.

Sorry guys!

Check out which other stars let someone else step in to go bare.

(Reuters)

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Natalie Portman

There was some confusion over whose backside was shown in a thong in 2011's "Your Highness," but Natalie says, "There's one shot that's me and the shot of her diving into the water is a body double, because I didn't wanna go in the water - it was really, really cold."

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Jennifer Aniston

For the lingerie scene in "We're the Millers" another blonde stepped in with almost identical hair to Jen Aniston, but if you look closely, you can tell she's more blonde than the star.

Kate Beckinsale

It was first reported that Kate asked for a body double for a shower scene in "Whiteout" where the camera was going to pan over her derriere. But the studio said it was standard procedure.

"The claims appearing on the Internet today that Kate Beckinsale requested a body double for filming 'Whiteout' are absolutely untrue," the studio said. "As is standard practice on many movies, a body double was hired for several scenes by the production and not at the request of Kate Beckinsale."

Of course the actress isn't the only star who takes a back seat when it comes to showing skin.

Click through to see who else fooled you.

(AP)

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Jessica Alba

Jessica Alba has always been outspoken about not appearing nude in films, so it left many wondering whether or not she used a body double to film the crazy scenes in "The Killer Inside Me" (2010).

That same year it looked like she also went nude for "Machete," but her rep set the record straight.

“Jessica has been steadfast in her resolve not to appear nude in films from the beginning of her career," her rep explains. So instead, the nude look was digitally created.

"The decision to digitally remove the underwear from the shower scene in 'Machete' was one she and [director] Robert Rodriguez made together, which would serve his vision for the film, as well as honor her personal convictions regarding nudity," she said.

Okay okay! Relax!

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Isla Fisher

The "Wedding Crashers" star had a body double for her topless scenes.

"I feel like if you have a female comic character and then you see her nipples, then she is no longer funny, which is clearly wrong, but that was my theory, and that's why I didn't want to do it," she said.

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Owen Wilson

Wilson had a butt double in "You, Me and Dupree."

"The director made that decision not to use my butt," he said. "I don't know how to interpret that."

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Luke Wilson

Owen wasn't the only Wilson brother to use a butt double... Luke hand-picked his stand-in for "My Super Ex-Girlfriend."

"I thought it might be a good time to sit on the bench for that scene and let some other kind of more athletic guy take over there," he said.

(Reuters)

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Vera Farmiga

The "Up in the Air" star had just given birth before filming the award-winning movie, so when it came time to strip down for her steamy scenes with George Clooney, the actress had to call in some help.

"The breast milk down both sides -- it would have been inappropriate," she told Entertainment Weekly.

(AP)

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Freida Pinto

A scene in "Immortals" called for a shot of the gorgeous actress' backside, but she was relieved when the filmmakers chose to go with a double.

“It was a butt double," she told E! Online. "I’m relieved I don’t have to deal with that issue."

(AP)

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Mila Kunis

Her flick, "Friends with Benefits" may show a lot of skin, but not all of it is hers, explains the gorgeous brunette.

"I showed side boob and I figured I can't just give everything all away at once," she says. "I gotta let it all out in little pieces here and there."

So instead of stripping down when it came time to show the world her derrière, Mila stepped back and helped find a double that could stand in for her.

'These lovely women had to show us their derrière and we chose the one that resembled my body the most without looking like it is fake," she explains.